Asteroids

2340 Hathor help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.464

Aphelion (Q)

1.223

Eccentricity (e)

0.450

Inclination (i)

5.9

deg

Orbit period (P)

283.1

Earth MOID

0.00640

U parameter

0.0

A₂

-30.1

10^-15au/days²

Next Earth close approach

Date

2033-01-13

Nominal distance (from Earth center)

0.19971

29876891

Maximum Brightness

20.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.3

mag

Diameter

210

Taxonomic type

Rotation period (T)

3.358

Discovery Information

Discovery Date

1976-10-22

Observatory

Palomar Mountain

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.843750

1-sigma variation

8.369E-10

Unit

Eccentricity (e)

Value

0.449956

1-sigma variation

2.631E-8

Unit

Inclination (i)

Value

5.8602

1-sigma variation

2.725E-6

Unit

Long. of Ascending Node (Ω)

Value

211.2073

1-sigma variation

1.206E-5

Unit

Arg. of Perihelion (ω)

Value

40.2039

1-sigma variation

1.288E-5

Unit

Mean Anomaly (M)

Value

96.28839

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.464099

1-sigma variation

Unit

Aphelion distance

Value

1.223400

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.503996

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.030434

1-sigma variation

Unit

MOID

Value

0.006397

1-sigma variation

Unit

Orbit Period

Value

283.0864

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-30.12646

1-sigma variation

0.49348

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	7.00366E-19	-1.64297E-17	-5.96946E-16	-1.25336E-15	1.45420E-15	-3.99027E-15	3.68381E-10
e	-1.64297E-17	6.92231E-16	2.12217E-14	1.08750E-14	-1.49153E-14	6.39095E-14	-8.61158E-9
i	-5.96946E-16	2.12217E-14	7.42323E-12	1.61722E-11	-1.76478E-11	5.14388E-12	-3.41471E-7
Ω	-1.25336E-15	1.08750E-14	1.61722E-11	1.45459E-10	-1.55271E-10	2.18988E-11	-6.61341E-7
ω	1.45420E-15	-1.49153E-14	-1.76478E-11	-1.55271E-10	1.65980E-10	-2.43135E-11	7.62687E-7
M	-3.99027E-15	6.39095E-14	5.14388E-12	2.18988E-11	-2.43135E-11	2.79217E-11	-1.94070E-6
A₂	3.68381E-10	-8.61158E-9	-3.41471E-7	-6.61341E-7	7.62687E-7	-1.94070E-6	2.43518E-1

Date of computation: 2026-06-04 23:11 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

3.358

Unit

Source

[3]

Quality

Value

2,R

Unit

Source

[3]

Amplitude

Value

0.11-0.18

Unit

mag

Source

[3]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[1]

Taxonomy (all)

Value

CSU;Sq

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.336

20.2

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

0.15**

0.15

Unit

Source

[4]

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.6

Unit

Source

[8]

Diameter

Value

210

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.77

0.5

Unit

B-V

U-B

Source

[6]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[9]

[10]

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Sources

No.	Name	Additional
[1]	EARN	1.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)
[2]	EARN	1.) McFadden, L.A. et al. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 442-467. (Physical properties of Aten, Apollo and Amor asteroids) 2.) Tholen, D.J. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1139-1150. 3.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 4.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)
[3]	EARN	1.) Warner, B.D. (2015) MPB 42, 115-127. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2014 OCTOBER-DECEMBER)(43NEAs) 2.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Tedesco, E.F. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1090-1138. 2.) Chapman, C.R. et al. (1994) in "Hazards due to asteroids and comets", (T.Gehrels, ed.), Univ. Arizona Press, Tucson, USA, pp. 537-549.
[6]	EARN	1.) Tedesco, E.F. (1989) in "Asteroids II" (Eds. R.P.Binzel et al.), Univ.Ariz.Press, Tucson, USA, pp. 1090-1138.
[7]	EARN	1.) Giorgini, J.D. et al. (2014) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09200/09272.html"> 9272. (2340 Hathor) (Radar obs., detection of Yarkovsky drift) 2.) Chapman, C.R. et al. (1994) in "Hazards due to asteroids and comets", (T.Gehrels, ed.), Univ. Arizona Press, Tucson, USA, pp. 537-549. 3.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)
[8]	EARN	1.) Thomas, C.A. et al. (2011) Astron. J. 142, 85. (ExploreNEOs. V. AVERAGE ALBEDO BY TAXONOMIC COMPLEX IN THE NEAR-EARTH ASTEROID POPULATION) (new albedos data for 118 NEOs) 2.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Giorgini, J.D. et al. (2014) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/09200/09272.html"> 9272. (2340 Hathor) (Radar obs., detection of Yarkovsky drift)
[10]	EARN	1.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 2.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

17986

Unit

Source

[1]

Unobserved

Value

181

Unit

Source

[1]

Normalized RMS of residuals

Value

0.723037

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1976-10-22.27778

Unit

Source

[2]

Last Observation

Value

2026-01-18.934684

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1478 (30)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2014-10-20

Unit

Source

[3]

Last Observation

Value

2014-10-22

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

7 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2340 Hathor from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
MERCURY	1951-10-22 06:08	1.1	0.0309659	0.0309477	0.0000061
EARTH	1952-10-21 18:42	< 1 min	0.0673760	0.0673555	0.0000068
EARTH	1957-01-15 10:13	< 1 min	0.1200924	0.1200822	0.0000034
EARTH	1959-11-07 12:40	1.4	0.1904174	0.1904085	0.0000030
MERCURY	1962-08-29 00:54	1.1	0.0418742	0.0418615	0.0000042
EARTH	1964-01-16 02:33	< 1 min	0.1387622	0.1387530	0.0000031
EARTH	1969-10-24 06:37	< 1 min	0.1640629	0.1640554	0.0000025
EARTH	1976-10-20 16:53	< 1 s	0.0077523	0.0077522	0.0000000
MERCURY	1980-06-22 01:31	< 1 min	0.0289409	0.0289407	0.0000001
EARTH	1981-01-06 11:59	< 1 min	0.1780107	0.1780105	0.0000001
EARTH	1983-10-26 02:05	< 1 s	0.1159724	0.1159722	0.0000001
EARTH	1988-01-17 17:22	< 1 s	0.1058641	0.1058639	0.0000001
EARTH	1995-01-16 06:34	< 1 s	0.1372734	0.1372731	0.0000001
EARTH	2000-10-25 05:57	< 1 s	0.1969743	0.1969742	0.0000001
MERCURY	2005-04-13 10:38	< 1 s	0.0317615	0.0317614	0.0000001
EARTH	2007-10-22 05:42	< 1 s	0.0599836	0.0599835	0.0000000
MERCURY	2012-04-04 06:19	< 1 s	0.0342298	0.0342296	0.0000001
EARTH	2014-10-21 21:27	< 1 s	0.0482464	0.0482464	0.0000000
EARTH	2019-01-13 18:01	< 1 s	0.1440387	0.1440385	0.0000001
EARTH	2021-11-01 01:58	< 1 s	0.1606218	0.1606217	0.0000000
EARTH	2026-01-17 11:23	< 1 s	0.1044074	0.1044073	0.0000000
MERCURY	2030-02-04 15:54	< 1 min	0.0448072	0.0448069	0.0000001
EARTH	2033-01-13 13:46	< 1 s	0.1997147	0.1997144	0.0000001
MERCURY	2037-01-23 07:59	< 1 min	0.0421305	0.0421301	0.0000002
EARTH	2038-10-23 08:51	< 1 s	0.1136395	0.1136389	0.0000002
EARTH	2045-10-21 08:09	< 1 s	0.0241942	0.0241935	0.0000002
EARTH	2050-01-13 12:57	< 1 s	0.1441335	0.1441333	0.0000001
EARTH	2052-11-02 13:40	< 1 min	0.1696850	0.1696847	0.0000001
EARTH	2057-01-16 13:45	< 1 s	0.1203132	0.1203125	0.0000002
EARTH	2062-10-25 12:10	< 1 min	0.1810057	0.1810039	0.0000006
EARTH	2069-10-21 08:24	< 1 s	0.0065601	0.0065587	0.0000004
EARTH	2074-01-15 15:24	< 1 min	0.1268554	0.1268380	0.0000058
MERCURY	2084-04-12 23:13	6.8	0.0364713	0.0363898	0.0000272
EARTH	2086-10-21 16:06	< 1 min	0.0055157	0.0055135	0.0000010
EARTH	2091-01-15 16:40	66.7	0.1320632	0.1305576	0.0005071
MERCURY	2098-12-17 16:31	343.4	0.0371665	0.0303924	0.0025718
EARTH	2103-10-23 05:02	58.6	0.0325943	0.0225704	0.0033613
EARTH	2108-01-11 02:19	313.2	0.1697015	0.1669623	0.0009188
EARTH	2110-11-01 03:07	63.8	0.1518506	0.1510367	0.0002713
MERCURY	2113-09-01 04:15	210.1	0.0376984	0.0351904	0.0008536
EARTH	2115-01-18 08:03	60.4	0.1232923	0.1209902	0.0007896
EARTH	2120-10-25 11:46	178.3	0.1576120	0.1448949	0.0042393
MERCURY	2124-06-28 21:40	701.6	0.0444431	0.0282019	0.0066658

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
113.87182399	284.25325480	0.00639697	MINIMUM
248.90488875	12.58701971	0.10020038	MINIMUM
183.20084745	329.22715264	0.24862006	SADDLE
3.12919541	150.92173573	0.55237067	SADDLE
2.43148744	329.78376222	1.44930672	SADDLE
180.57418410	147.64008980	2.23634430	MAXIMUM

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MOID Plots

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